Abstract
Autofrettage of pipes or pressure vessels for high pressure applications is a common and well-known procedure to extend the fatigue life by introducing a compressive residual stress at the inner fiber, see, e.g., [1,2].
In general, applying autofrettage to a high-pressure component requires a mechanical calculation, which normally consist of the following three main steps: 1) Calculation of the corresponding pressure based on a desired autofrettage depth, i.e., a restricted portion of the wall thickness 2) Calculation of an upper limit to ensure protection against plastic collapse during the autofrettage process 3). Calculation of an upper limit to prevent reverse yielding upon releasing the autofrettage pressure.
In order to perform that mechanical calculation as efficient as possible, we will present an analytical approach based on dimensionless coefficients that separates geometry and material properties and allows for the determination of the autofrettage pressure as a function of the particular yield strength under consideration.
